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MMA7450L Datasheet(PDF) 9 Page - Freescale Semiconductor, Inc |
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MMA7450L Datasheet(HTML) 9 Page - Freescale Semiconductor, Inc |
9 / 22 page Sensors Freescale Semiconductor 9 MMA7450L is then driven high at the end of a transmission. SPC is the Serial Port Clock which is also controlled by the SPI master. SDI and SDO are the Serial Port Data Input and the Serial Port Data Output. The SDI and SDO data lines are driven at the falling edge of the SPC and should be captured at the rising edge of the SPC. Read and write register commands are completed in 16 clock pulses or in multiples of 8, in the case of a multiple byte read/write. SPI READ OPERATION A SPI read transfer consists of a 1-bit Read/Write signal, a 6-bit address, and 1-bit don’t care bit. (1-bit R/W=0 + 6-bits address + 1-bit don’t care). The data to read is sent by the SPI interface during the next transfer. See Figure 11 and Figure 12 for the timing diagram for an 8-bit read in 4 wire and 3 wire modes, respectively. Figure 11. SPI Timing Diagram for 8-Bit Register Read (4 Wire Mode) Figure 12. SPI Timing Diagram for 8-Bit Register Read (3 Wire Mode) SPI WRITE OPERATION In order to write to one of the 8-bit registers, an 8-bit write command must be sent to the MMA7450L. The write command consists of an MSB (0=read, 1=write) to indicate writing to the MMA7450L register, followed by a 6-bit address and 1 don’t care bit. The command should then be followed the 8-bit data transfer. See Figure 13 for the timing diagram for an 8-bit data write. Figure 13. SPI Timing Diagram for 8-Bit Register Write (3 Wire Mode) |
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